Loans Receivable, Net (Details - Modifications Types and Financial Impact) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($) loan	Mar. 31, 2015 USD ($) loan
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loan	207	249
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 20	$ 19
Re-Age Extension or Interest Capitalization with Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Post-Modification Recorded Investment	6	2
Other with Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Post-Modification Recorded Investment	1	1
Other without Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 13	$ 16
One- To Four-Family [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loan	14	6
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 5	$ 1
One- To Four-Family [Member] | Re-Age Extension or Interest Capitalization with Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Post-Modification Recorded Investment	4	1
One- To Four-Family [Member] | Other with Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	0
One- To Four-Family [Member] | Other without Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 1	$ 0
Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loan	193	243
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 15	$ 18
Home Equity [Member] | Re-Age Extension or Interest Capitalization with Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Post-Modification Recorded Investment	2	1
Home Equity [Member] | Other with Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Post-Modification Recorded Investment	1	1
Home Equity [Member] | Other without Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Post-Modification Recorded Investment	12	16
Home Equity [Member] | Other without Interest Rate Reduction [Member] | Fixed Rate Lock Loan Modification Program 1 [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 9	$ 14